Run from both of them.
Tasia's hasn't paid me in well over a year. They are supposed to be paying every month now (since January) and I still haven't received anything. There are a lot of other people who have never been paid.
Millers never has any rewards up. I've been waiting over 3 months to redeem for something and by the time they posted new prizes and I went to look they only had 1 or 2 items left that I couldn't use.